I prefer to draw file mine like you would a card scraper. Even a crappy old dull file cuts that plastic like buuttteeerrr...


Also 45 is way to steep 50 or bust. Back beveling.... I dunno... seems like coping the back with a curved scraper would be the best way to handle that

Seriously though this is actually something I've done for years and it does make the ice peal off a lot better than the old dull beat up edge.